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Conference paper

Cascaded Switched-Capacitor dc-dc Converters for a USB Power Delivery Compliant Charger

In Proceedings of 4 Th Ieee International Future Energy Electronics Conference — 2019, pp. 1-8

By Overgaard, Jacob E. F.1; Hertel, Jens Christian2,3; Zsurzsan, Tiberiu-Gabriel2,3; Zhang, Zhe2,3

From

Technical University of Denmark1

Electronics, Department of Electrical Engineering, Technical University of Denmark2

Department of Electrical Engineering, Technical University of Denmark3

The improvements in modern circuit technology reduce system size, improve the efficiency and reduce the cost. Utilization of soft-switching resonant power converters give high density high effeciency power converters for narrow output voltage ranges. To overcome this a cascaded switched-capacitor dc-dc converter is used to implement a Universal Serial Bus Power Delivery compliant charger.

The converter uses a custom designed application specific integrated circuit designed for switched-capacitor dc-dc converters and wide bandgap technology allowing high frequency, high power design. The converter achieves peak efficiencies up to 98 % at 60 W output power with a corresponding junction temperature of 50 ◦C.

Worst case junction temperatures reach 64 ◦C and is viable for use in longterm battery charger systems. The cascaded power stages take up 14 mm × 22 mm.

Language: English
Publisher: IEEE
Year: 2019
Pages: 1-8
Proceedings: 2019 IEEE 4th International Future Energy Electronics Conference
ISBN: 1728131537 , 1728131545 , 9781728131535 and 9781728131542
Types: Conference paper
DOI: 10.1109/IFEEC47410.2019.9015103
ORCIDs: Hertel, Jens Christian , Zsurzsan, Tiberiu-Gabriel and Zhang, Zhe
Keywords

ASIC Analog integrated circuit Battery chargers Switched mode power supplies

Other keywords

Capacitors DC-DC power converters Impedance Switches Universal Serial Bus Voltage control

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